The Lüscher color test is a psychological test invented by Dr. Max Lüscher. The Lüscher-Color-Diagnostic® measures a person's psychophysical state, his or her ability to withstand stress, to perform, and to communicate. It uncovers the cause of psychological stress, which can lead to physical symptoms.

Max Lüscher recognized that the sensory perception of color is objective and universally shared by all, but that color preferences are subjective, which is a distinction allowing subjective states to be objectively measured by using test colors.

Using 5015 precise definitions, the selections from among these pre-determined test colors measure the state of 23 personality traits, some of which lie outside the realm of the conscious.

Because the color selections are guided in an unconscious manner, they reveal the person as he or she really is, and not as he or she perceives him- or herself, or as he or she would like to be perceived, which occurs when questions are asked directly or by questionnaires.

The results of the Lüscher-Color-Diagnostic® contain indications pertaining to personal assessment and special, professional recommendations as to how psychological stress and the resulting physical symptoms can be avoided. It also offers additional information for verbal and homeopathic therapy.

It is claimed by proponents of the test that this analysis allows a rapid and deep personality analysis to be made from only this color ranking information.